JPH0242024Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ground wire tension clamp for installing an overhead ground wire on a steel tower.

When installing a single ground wire (especially common in power transmission lines of 154KV or less), install the ground wire 24 above the jumper wire 28 attached to the ground wire tension clamp 27, as shown in Figure 8. It is customary to joint the ground wire at the jumper wire. However, when connecting an overhead optical fiber cable in which an optical fiber is installed in the ground wire, it is necessary to connect while taking advantage of the optical communication characteristics of the optical fiber, so as shown in FIG. Optical fiber connection box 3
Since the jumper wire 28 is connected by providing the jumper wire 28 at the bottom as shown in the figure, it is easier to construct the jumper wire 28 than when the jumper wire 28 is crossed over the jumper wire.

In addition, in the case of two ground wires (especially common in multi-circuit transmission lines of 275KV or higher), they are installed at the top of the tower arm, so depending on the tower structure, both the upper and lower ends of the jumper wire are installed. The method has also been adopted,
Each time, I selected and installed tension clamps for upward and downward movements. For this reason, work at heights becomes more troublesome, and the number and types of tension clamps to be prepared increase, which increases storage and transportation costs. Therefore, if a tension clamp of the upper type is used in the lower type, the tension clamp will be used upside down, so the ground wire cannot be attached or removed from the ground wire guide groove of the clamp body under the counter-gravity direction. It is difficult to operate because it has to be operated from both directions, and when attaching the ground wire with a holding bracket, there are many problems such as difficulty in managing the appropriate torque of the mounting bolt, resulting in a lack of safety. In reality, we have no choice but to prepare different types of tension-resistant clamps.

In view of the above-mentioned points, the present invention provides a ground wire tension clamp capable of both lifting and lowering. In a ground wire tension clamp equipped with a ground wire holding fitting with opposing ground wire holding grooves,
A ground wire take-out groove that guides the ground wire upward into the ground wire guide groove is connected to a downward ground wire guide hole that reaches the lower surface of the clamp body from the vicinity of the point where this ground wire take-out groove starts, and this downward ground wire guide The feature is that one side of the hole is opened with a slit for taking in and taking out the ground wire.

Embodiments of the present invention shown in the drawings will be described below. 1, 2, and 3, a ground wire guide groove 3 is formed in the upper surface 2 of the clamp body 1, and the ground wire is held down by straddling this ground wire guide groove. A plurality of hinged ground wire holding fittings 5 with grooves 4 facing each other are arranged so that their hinge parts 6 are alternately located on both sides of the ground wire guide groove 3, and a tightening tool 7 is installed.
The clamp body 1 is attached to the clamp body 1 in an openable and closable manner, and the ground wire take-out portion 8 of the clamp body 1 is formed with a ground wire take-out groove that connects with the ground wire guide groove 3 and guides the ground wire 24 upward. A downward ground wire guide hole 10 is formed which extends from the place where the ground wire take-out groove starts to the lower surface part 9 of the clamp body 1. One side of this ground wire guide hole 10 is opened with a slit 11 to facilitate the insertion and removal of the ground wire.

Note that 12 in the figure is a tension clamp mounting pin.

Another embodiment shown in FIGS. 4, 5, and 6 has the same construction as the previous embodiment except for the ground wire holding fitting. That is, a ground wire guide groove 3 is formed in the upper surface part 2 of the clamp body 1, and a ground wire guide groove 3 is formed in the upper surface part 2 of the clamp body 1.
A ground wire take-out groove connected to the ground wire guide groove 3 and a downward ground wire guide hole 10 are formed in the ground wire guide groove 3, and one side thereof is opened by a slit 11. The ground wire holding fitting 13 disposed along the ground wire guide groove 3 of the clamp body 1 is attached by fitting the presser foot 15 into the mounting bolt 14 inserted obliquely upward from the bottom surface of the clamp body 1 and attaching it with a nut 16. , the contact surface 17 where the presser foot 15 contacts the clamp body 1 is vertical;
The bolt hole 18 of the presser foot 15 is made into an elongated hole so that the presser foot 15 can be moved up and down along the contact surface 17, and a ground wire presser is provided at the lower end of the presser foot 15 to face the ground wire guide groove 3 of the clamp body 1. A groove 19 is formed.

Since the present invention has the above-mentioned configuration, the tension clamp of the present invention, which is attached to the steel tower main body 20 via the U clevises 21, 22 and the one-piece link 23 as shown in FIG. As shown in FIG. 4, the ground wire 24 fixed to the ground wire guide groove 3 of the upper surface portion 2 of the clamp body 1 by the presser fittings 5, 13 can be installed above the ground wire take-out portion 8.
In addition, the ground wire guide hole 10 is inserted from the slit 11 into the ground wire guide hole 10 from the slit 11 on the ground wire extraction side that is temporarily tightened with the ground wire holding fittings 5 and 13 in the ground wire guide groove 3 of the clamp body 1 and has some play.
By fitting the ground wire 24 into the ground wire guide groove 3 on the top surface, the ground wire 24 will protrude downward through the guide hole 10. Since it can be easily fixed with the metal fittings 5 and 13, the lower part of the ground wire can be easily constructed. Further, it is possible to easily change the ground line from below to above or from above to below.

As is clear from the above explanation, the ground wire tension clamp according to the present invention has an upward ground wire take-out groove in the ground wire guide hole of the conventional ground wire tension clamp, and a downward ground wire guide with an opening on one side. Since the structure is as simple as just adding a hole, it is possible to easily select and carry out both over-erecting and under-erecting of the ground wire using inexpensive means. Therefore, the type and number of tension clamps can be halved compared to conventional ones, and storage is easy, making this an extremely useful device.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view taken along line A-A in Fig. 1, and Fig. 4 shows another embodiment of the invention. A side view, FIG. 5 is a sectional view taken along the line B-B in FIG. 4, FIG. 6 is a view taken in the direction of arrow C in FIG. 4, and FIG. 7 is a side view showing the installation state of the optical fiber cable connected at the steel tower location. , FIG. 8 is a side view of the conventional product. DESCRIPTION OF SYMBOLS 1... Clamp body, 2... Upper surface part, 3... Ground wire guide groove, 4, 19... Ground wire holding groove, 5, 13...
Ground wire holding fitting, 8... Ground wire take-out part, 10... Downward ground wire guide hole, 11... Slit for putting in and taking out the ground wire, 24... Ground wire, 28... Jumper wire.

Claims (1)

[Scope of utility model registration request] In a ground wire tension clamp that is equipped with a ground wire holding metal fitting that makes the ground wire holding groove face the ground wire guide groove along the ground wire guide groove formed on the upper surface of the clamp body, the ground wire is held in the ground wire guide groove. The ground wire take-out groove that guides the wire upward and the downward ground wire guide hole that reaches the lower surface of the clamp body from the vicinity of the point where this ground wire take-out groove starts are connected, and one side of this downward ground wire guide hole is connected. A ground wire tension clamp characterized by an opening with a slit for putting in and taking out the ground wire.